Polo-mallet head



Nov. 9 1926.

A. L. FREEDLANDER ET AL POLO MALLET HEAD griginal Filed Dec. 26. 1922 IMVENTQRS Hem/mm Z. Hi'EE L FINDER,

mLL/HM Gooowm,

ATTRNEY Nov. 9, 1926.

incaszz oration.

AIBlEtAHAItI L. FREEDLANDER AND W'ILLIAM G. GOODWIN, OF DAYTON. OHIO, AS-

SIGNORS TO THE RUBBER DEVELOPMENT COIVIIPAILWSZ'v F DAYTON. OHIO. A TRUST nsrarn.

POLO-MALLET HEAD.

original application filed December 26, 1922. Serial No. 608,979. Divided and this application filed April This invention relates to polo mallets and particularly to the heads of such mallets, and is a division of our application filed Dec. 26, 1922, Sci. No. 608,979.

53 It is an object of our invention to provide an improved polo mallet head -*which will withstand the severe blows and intense usage to which such mallet heads are subjected.

It is a further object of our invention to provide a polo mallet head made of a compound that has uniform strength, and is homogeneous or of successive densities, as desired, in order to produce the requisite efi'ects.

t is a further object of our invention to provide a polo mallet head of such compound that it will be economical to produce and have the physical characteristics and dielectric properties especially adaptable for the purpose.

Referring to the drawings, Fig. 1 is a perspective View of a polo mallet; and Fig. 2 is a sectional View of a polo mallet showing the head composed of our improved compound.

ln the accompanying drawings we have shown a polo mallet-consisting of a shaft 1 and a head 2 which may be composed of a compound consisting of the following ingradients:

Smoke sheets of rubber, rosin oil, sulphur, ammonium bicarbonate, dehydrated lime, hind ethyl-ideneaniline, and gas black.

lit is preferred to mix these several in gradients in fifty to one hundred pound lots. The following is a description of the method of mixing and preparing this compound on the basis of a one hundred pound lot.

We take the smoke sheets of rubber and masticate them for fifty minutes according to the usual practice. In the place of the smoke sheets'we may substitute fine para having the characteristic of great strength. We select 61 pounds and 12 oz. of such rubber.

it is essential that this rubber when finalmade u be used before it is twenty-four hours old ecause after that time it begins to recover its resiliency.

When these smoke sheets are worked on the mill until plastic at which time they have achieved a temperature of approxi- Serial No, 708,541.

mately 130 to 180 Fahrenheit, the latter temperature being approximately the safety temperature, we add' rosin oil to the extent of 1 pound and 13 oz. This is a softening and volatilizing agent. lVe then add .sulQ phur by sitting itin slowly as the rubber is being worked on the mill. We use for this purpose 18 pounds and 6 oz. of the sulphur which is of the fineness to pass through a 300 mesh screen. The sulphur is used for the usual purpose in compounds for promo-ting the vulcanization. Thereafter while the mixing is taking place the dehydrated lime which has been ground as fine as itis possible to secure it is incorporated in the mass to the extent of 3 pounds and 1 oz. The

lime is used to tough-en the compound and accelerates the reaction between the rubber and the sulphur. We then add 1 pound and 8 oz. of gas black for the purpose of giving color and some body to the mixture, but this may be omitted.

In the meanwhile, the ethyl-idene-aniline has been heated in a steam jacketed kettle to about the temperature of boiling water, that is to about 212 Fahrenheit. lVe then dip this out oi the kettle and incorporate 1 pound and 4: oz. thereof in the mixture in the mill. This acts as an accelerator to thereaction and adds tenacity to the resulting compound.

The last ingredient added is the ammonium bicarbonate to the extent of 4 pounds and 12 oz. This is added to give the spongy or aerated character to the compound. It is added last because the heat of mixing in the mill would volatilize it it added earlier in the process.

lit is essential that this compound be molded and vulcanized or blown within twelve hours after it has been mixed. The preferred practice is to mix fresh batches each day.

The temperature of the room in which it is kept and in which it has been mixed should be approximately Eahrenheit.

When it is desired to mold this compound into finished articles it is placed in a metal .mold which is jacketed for receiving steam under ressure and cold water. The compound is put in the mold and a core is inserted about which the compound is to be molded as also the handle for the head.

utes by varying the pound expands and is about one sixty fourth of c n i blown is when mold very great i set up in the mold during this moldin rocess.- This results in the compound having a porous appearance as shown at 3.

In some cases where it is desired to have a soft rubber coating on the resulting arti= ole the mold is lined with a soft rubber sheet. It is preferable to cement this sheet to the inside of the mold. The sheet itseli inch in The ter the heatis applied thickness.

When the mold is closed the ii turned on and the mold is kept he for one hundred thirty-five in; utes approximately. About one-third of this time in the beginning of the molding process the pressure of the steam is h gradually increased until it reaches a of eighty pounds. The remainder of the time the steam is held at an eighty pound pressure. At the end of the period the steam is cut oil and cold water is circulated through the mold to chill it and when it has been cooled the mold is opened, the core is e2- tracted and the finished article is thus com-- pleted.

These times are approximate depending upon the exact character of the resulting ma terial desired. The time may be varied from fifty minutes to one hundred thirt' -five minuantity or lime and ethyl-idene-aniline. The larger the quantity of such agents the less time needed will he understood that quantities are approximate and some variation is pos sihle.

The handle or shaft 1 oi the mallet, which may be made of steel any other messes seen in Fig. 2. The head 2 has a hollow portion as indicated at 4. The outer cover 5, of soft rubber, will prevent the halls from being damaged and reduce the noise.

The compound of which the head is com-- posed may be homo neous or may he of successive densities, t e latter sometimes be ing of great value.

Thus it will be seen that we duced a polo mallet which will be light in weight and at the same timebe of sufiicient strength; which will have the requisite resiliency; which will not damage the balls; and which will not be afi'ected by weather conditions.

Having thus fully described our inven *tion, what We claim as new and desire to secure by Letters Patent, is

l. A polo mallet, com rising a shaft and a head composed of a ru ber compound and having a hollow interior, and a covering for said head.

2. A polo mallet, comprisin a shaft, and a head composed of vulcanize rubber, having a covering and a hollow interior.

3. A polo mallet comprising a shaft and a head consisting of portions of varying degrees of porosity and density, the inner portion of said head being relatively porous and the next outer portion homogeneous therewith being relatively dense,. both of said portions constituting a structure hi h-- ly resistant to shock and resistant to eformation and hreakage.-

during the forming of the head, as will be have pro- In testimony whereof, welafiix our signa LURE] ABRAHAM L. FREEDLANDER.

WILLIAM G. GGODWIN. 

